Table-feed of grinding or like machines.



A. S. L R. RED. A TABLE FEED 0F GmND'lNG 0R LIKE MACHINES. APPLICATION FILED MAY l2, I9l7.

51,293,621- Patented Feb. 4, 1919.

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A. S; It R. REID.

TABLE FEED OF GRINDING 0R VLIKE MACHINES.

' APPLICATION FILED MAYIZ i917. Lgm. Patented Feb.4,1919.

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Patented Feb. 4, 1919.

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I L/f A. s. L R. REID.

TABLE FEED 0F GRINDING 0R LIKE MACHINES.

APPLICATION FILED. MAY I2, 1917.

Innen/fam.' .Hna/rear 5. fet'd ANDREW S. RED) AND ROBERT REID, 0F BEVERLY, MASSACHUSETTS.

TABLE-FEED OF GRINDING OR LIKE MACHINES.

Specification of Letters Patent.

Patented Feb. 4, 1919.

Application filed May 12, 1917. Serial No. 168,211.

To all 'whom t may concern:

Be it known that we, ANDREW S. REID and ROBERT Ren), citizens of the United States, and both residents of Beverly, in the county of Essex and Commonwealth of Massachusetts, have invented an Improvement in Table-Feeds of Grinding or like Machines, of which the following description, in connection with the accompanying drawings, is a specification, like lcharacters on the drawings representing like parts Ain each of the several views.

This invention relates to table feed mechanisms of metal working or like machines wherein the table is reciprocated with reference to the operating tool and also fed transversely of its direction of reciprocation. The invention is well adapted for use in the table feed of a rotary power driven grinding machine and is herein shown in such an embodiment for illustrative purposes. One important object of the invention is to provide improved means adapted for positively feeding the table transversely of the direction of its reciprocation at both ends of the operative stroke. A further object is to provide an improved feed motion wherein` the feeding impulse is obtainedby a part turn only of the operated feeding element, and with a one direction movement on the connecting link bar for each feed stroke, c'. e., for the feed movement, associatedwith both directions of table movement. A further object is to provide an improved intermittent ratchet device for operating the feed that is automatically engageable to operate the feed positively during the feed stroke, and operable automatically to disengage the feed connection at the end of each feed stroke, the means for thus engaging and disengaging the feed being adjustable readily and conveniently so that the rate of feed may be varied at will. The foregoing and other objects and advantages of the invention will more fully appear from the fol lowing detailed description, and the distinctive features of novelty will be pointed out in the appended claims.

Referring to the drawings:

Figure 1 is a front elevation showing a machine having our invention incorporated therein;

tion broken away, showing the important working parts;

Fig. 4 is a detail elevation showing the ratchet trip and reversing device; and

Fig. 5 is a sectional detail on line 5-5 of Fig. 2.

In the present embodiment the invention is shown applied t0 a known type of grinding machine employing an upright column supporting for vertical adjustment a rotary grinding disk, it being understood that this is intended merely to typify one of the uses to which the mechanism of the invention is adapted. In the present embodiment the upright column of the machine is indicated at 10 equipped with transverse V-slide ways 11, 11 suitably spaced apart to receive and guide the V-rails 12a, 12a of the transversely movable subtable 12 which is equipped with slide ways 13 on which the table pro-per 14 is mounted for reciprocating sliding movement. A pillar 15 extends upward from the pedestal base 10 and is equipped with vertical slide ways 16 in which is mounted the bear; ing head 17 of the rotary grinding disk 18, this head being vertically adjustable by means of the screw 19 and operating device 20 connected to operate a nut engaged with said screw by means of bevel gearing 21.V The grinding wheel 18 is shown as driven by a belt 22 which passes around pulleys 23 at the base of the machine and thence to any suitable driving source, all as common and well known in the prior art. For operating the table 14 a rack 24 carried thereby is engaged by a gear 25 driven from a pinion,

26 slidalbly keyed on a shaft 27 journaled transversely in the frame base of the machine. The shaft 27 is 1n turn driven through a pair of mating gears 28 from aV shaft 29 also journaled in bearings of the frame work. Since this shaft 29 does not extend across the base frame the forward side of said base is provided with an inwardly extending boss or sleeve 30 affording bearings for said shaft at the inner end thereof. The shaft 29 has rigid therewith a hand wheel 31 without the frame for manual operation of the table when desired. For transmitting power drive to the table, the shaft 29 has loosely fitted at its inner end a bevel gear 32 equipped with a clutch face 33 at its inner side. A clutch key 34 slidably fitted at the inner end of the shaft 29 and held from Aturning with respect thereto, operable by a rod 35 fitted through the shaft 29 which is bored therefor, is adapted to slide the key .34 into and out of engagement with the clutch face 33, having for this purpose a handle end 36 projecting without the handle 31. Upon the uniting of the gear 32 with the shaft 29 by engagement of the clutch key 34 with the clutch face 33, the table is driven by a bevel pinion 37 meshing with the gear 32, this pinion being fixed at the inner end of a shaft 38 journaled in bracket bearings of the frame housing and having slidably keyed adjacent its oth'er end portion a clutch sleeve 39 formed with opposite clutch faces 40, 41, `adapted upon the shifting of said clutch sleeve to alternately engage mating clutch faces on opposite bevel gears 42, 43 loosely journaled on the shaft 38, and held from endwise movement outward by bearing shoulders 44 of the bearing bracket of the frame. The gea-rs 42, 43 are in mesh with the opposite sides lof a bevel pinion 423 fixed on a shaft 424 journaledin the frame and driven by a belt 425 from the prime drive of t-he machine, this belt as shown being driven 'by a pulley rigid.. with one of the pulleys 23. Thus gears 42, 43 are continuously rotated in opposite directions. For shifting the clutch sleeve 39 as the table vcomes to the end of its movement in each direction, lever arms 45 the lower ends of `which engage an annular groove in `said clutch sleeve are provided, these lever arms being iixed to or formed with a shaft 46 j ournaled in the frame, this shaft being of a length corresponding to the range .of vcross feed travel of the table and having at its extremities upSt-anding lever arms 47, the upper ends of which have fitted thereto a rod 48 engageable by the slotted lower end 49 of a lever 50.` The lever 50 is :l'ulcrumed at 51 to the sub-table 12 and has an arm 52 thereof extending upward of said,

fulcrum engageable by trip blocks 53 adjustably clamped to a slot 54 formed in the side of the table 14. The lower forked end 49 of the lever 50 is'adapted to slide along tlie rod 48 to preserve engagement therewith throughout the range of transverse feed of the `table asnow to be explained. F or feeding thel sub-table 12 with the table proper 14 transversely, a screw has its plain end journaled and held from endwise movement in the machine frame work at 56. This screw engages a nut 57 formed with or secured to a housing 58. which embraces and holds for movement therewith the gears 25, 26. This housing is secured as -by clamp Ibolts 59 to the sub-table 12 thus transmitting the feed movement' to said table and also constraining the gears 25, 26 to move therewith so as to keep in mesh with the rack 24 of'the table 14. For operating the screw 55,` it. has fixed` thereon a ratchetwheel 60 keyedV adjacent the outer end of said shaft, the extremity of the shaft without said ratchet wheel having xed thereto a hand wheel 61 lfor manual operation of the screw when desired. For imparting power feed to the screw the ratchet wheel 60 is engaged byla pawl` (i2-'pivoted at G3 to an arm 64'of a head 65 rotatably fitted on the plane shaft end 55EL of the screw 55, said head 65 fitting between the ratchet wheel 60 and the boss 66 projecting out from the frame base.V The head 65 has its inner portion"formed as a spur gear pinion 67. This pinion is inclosed by a housing 68 which can turn thereon which has at one side thereof a guidesleeve or `barrel 69 in which is fitted a rack bar 70 shown as circular in cross section and with yrack teeth on one side thereof to engage the teeth of the pinion 67. The y inner end of the rack bar 7 0 is pivoted at 71 to a lug 72 projecting from an oscillating head 7 3 journaled on the shaft 29 and fitting against` a boss 74 .of the machine frame. This head 73 has `pivoted thereto spaced apart pawls 7 5 which have connected thereto the respective ends of a tension spring 7 6, the action of which tends constantly to draw said pawls toward each other and against a ratchet wheel 77 which is keyed on the shaft 29 adjacent the side of the head 73, said head 73 having a peripheral flange 73a to constitute a housing for said ratchet wheel and the pawls 75. Partly encircling the oscillating head 7 3 and opposite the arms 72 is an arcuate member 78 fixed to the machine frame and having a long undercut slot 79 concentric with the Shaft 29. In this slot are adjustably clamped headed T-bolts 80 constituting .stop blocks to engage an outward-ly projecting arm 81-of a pawl controlling device whichis pivoted at 82 t0 the head 73 and has formed therewith oppositely extending lingers 83 engageable with rearwardly projecting heels 84 of the respective pawls 75, upon a shifting of said arm 81 to either side .of a radial post by engagementwith one or the other of the sto-p blocks 80. It is to 'be noted that the intermediate portion of the arcuate slot 7 9 is opposite a line drawn from the shaft `36 to the centerof pivotal movement of the arm 70 as slidably held in the housing 68, z'. e., opposite a projection' of the bar 70 when it is straight with the arm 72, andthe stop blocks 80 arep-referably set substantially equal distances at either side of such line. In thisway said stop blocks will operate the arm 81 to trip ont each Yofthe respective pawls 75 and permit the other pawl to become operative when the arm 72 has swung to the same distance atthe respective sides from such straightened middle position. It may now be understood that in operation as the Vshaft 27 fis operatedto-move the table 14 in each direction for its reciprocation, at the beginning of such movement, the clutch elements Y33, 34 being understood to be engaged, the ratchet wheell77 lwill operate one of the lpawls 75,

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z'. e., the upper one as shown in Fig. 4 to turn the rotary head 73 with its arm 72, thus initially pushing the ra-ck bar and thus turning the pinion 67 and moving the ratchet wheel 60 of the feed screw forward. This forward movement continues until the arm 72 straightens with respect to the rack bar 70 whereupon the final half of the movement of the head 73 draws back the rack bar 70 ready for a new feed stroke, the pawl 62 then of course slipping back over the ratchet teeth 60. Then when the arm 72 has reached an angular position with respect to the bar 7 0 corresponding to and opposite its initial position, one of the stops 80fcomes into action,

swinging the arm 81 to trip the then operative pawl out of engagement with the ratchet wheel 77 and permitting the other pawl to become engaged with said ratchet wheel under the action of the spring 76. The pawl which is now brought to operative position does not become operative for feeding however until after the table 14 has completed its operative movement and is started on its stroke in the other direction, whereupon the direction of movement of the shaft 27 being reversed, the pawl 75 which as stated is then released and in operative position, moves forward against the ratchet wheel 77 making another operative movement which is transmitted to the rack bar 70 the same as already described. Thus it will be noted that there is a feeding impulse imparted to the screw 55 at the end of each movement of the table 14 in either direction. Further that this movement is complete at each impulse for not only moving forward the feed pawl but also for returning it to initial position ready for the next feed stroke. It is further to be noted that the feed thus provided is absolutely positive and reliable with no possibility of slippage or lost motion and is at the same time readily controllable and adjustable in a most convenient manner to vary the rate of feed at will, this being effected merely by adjusting the stop members 80 in the arcuate slot 78. While the described adjustment of the stops 80 so that they will be positioned equally distant from a projection of the bar 70 when straightened with the arm 72 may be considered a normal setting of the machine for ordinary work and wherein it is desired to have an equal transverse feed at each table movement, it is to be understood that the present mechanism may also be readily setA so as to get a longer transverse feed on the movement of the table in one direction7 than is obtained on the movement thereof in the other direction, this being useful for certain kinds of work where a relatively heavy feed may be employed in one direction of table movement for a rough dressing operation and then the shorter feed in the other direction utilized to more nicely finish and smooth the work. With the present device this result may be obtained by spacing the stops 80 at unequal distances at the respective sides of the projection of the bar 70 when straightened with the arm 72 as already explained. We are aware that the invention may be embodied in other specific forms as to its details of construction and we therefore desire the present embodiment to be considered in all respects as illustrative and not restrictive, reference being had to the appended claims rather than to the foregoing description', to indicate the scope of our invention.

Having described our invention, what we claim as new and desire to secure by Letters Patent is:

l. A machine of the kind described, comprising a reciprocating table for presenting a work piece to an operating tool, means for reciprocating said table, and means for feeding said table transversely, including connections having a reversible clutch device interposed therein, and means associated with said clutch device for automatically disengaging the clutch connection after a predetermined feed movement at the beginning of an operative stroke, and simultaneously setting said clutch device in position for operation by the reverse movement of the succeeding reverse stroke of the table.

2. A machine of the kind described, comprising a reciprocating table for presenting work to an operating tool, means for reciprocating` said table, and means for feeding the table transversely consisting in power connections including a ratchet wheel and reversely acting pawls associated therewith, said pawls having provision tending to cause them to engage said ratchet wheel, and means automatically operative at the beginning of the feed stroke of the table for holding one of said pawls disengaged while permitting the other to engage said wheel and having provision for rendering the active pawl inactive and the inactive pawl active after a predetermined extent of feed movement by table strokes in each direction.

3. A machine of the kind described, comprising a reciprocating table for presenting the work to an operating tool, means for reciprocating said table, and means for feeding said table connected to be operated by said table reciprocating means, and including an oscillating member having a clutch device equipped with means for engaging the same automatically for a predetermined period on each table movement to swing the same through a predetermined arc and effect a feed movement at each table movement.

4. A machine of the kind described, comprising a reciprocating table for presenting the work to an operating tool, reciprocating means therefor, and means for feeding the table transversely, connected to be operated by said table reciprocating means and including an operating screwwith a pawl and ratchet drive therefor, and means for moving said pawl consisting in an oscillating member having an intermittent device connecting it with said table operating means,

and means governing said intermittent device whereby said oscillating member is caused to move forward said pawl for feeding, and then retract it at each feed oper- !ating stroke of the table whereby the table said table transversely including a ratchet wheel and 'a swingingly mounted pawl cooperative therewith and an oscillating device having provision to be operated and controlled by said table reciprocating means for moving said pawl forward to effect a feed movement and then retract it at each operative stroke of the table, whereby the table is fed transversely at each operative stroke.

6. A vmachine of' the kind described, comprising a `table equipped with means for reciprocating'the same, and means for feeding said table transversely including` a ratchet wheel and a' swingingly mounted pawl cooperative therewith and an oscillating device having provision to be operated and con-- trolled by said table reciprocating' means for movingsaid pawl forward to effect a feed movementv and then retract it at each operative stroke of the table, said oscillating device having adjustable means associated therewith. for variably actuating said pawl on its operative strokes.

7.' A'machine of the kind described, comprising a table equipped with means for reciprocating the same, and means for feeding said table transversely including a ratchet wheel `and a swingingly mounted pawl coreciprocating said table, means for feeding said table transversely, having connections controllable by said table, reciprocating means :for imparting thereto afeed nievement on a reciprocatory movement of the table in each direction, and a clutch having an operating member `projecting so as to be convenient fo-r hand operation, for rendering said table reciprocating means and said table feeding means operative or inoperative at will.

9; A machine of the kind described, 'comprisinga reciprocating table for presenting a work piece toan operating tool, means for reciprocating said table, means for feeding said table transversely, consisting in positive oscillating connections having provision to be brought into engagement automatically for feeding the table at Aeach reciprocatory stroke thereof, said connections including adjustable devices permitting the feed move- ANDREW S. REID. ROBERT REID.

Copies of this patent may be obtained for five cents each, by addressing the Commissioner of Patents,

, Washington, D. G. 

